Either hooking up with Tom OR making Marco her bitch. Tom because the past relationship was so hard to swallow that her immediately hooking up with him offscreen felt unbelievable, and the show doesn't do it any favors either by rarely showing it and making it hard to believe either's getting much out of it when they do (Tom seems like he blows off Star all the time but also is constantly asking if he's better than Marco. Star puts up with this why?). I guess I wouldn't say that makes her a "cunt," though, just hard to like as much as before because the way the relationship happened was too much bullshit to even buy her as the same character anymore.
Her making Marco her bitch does, though. The guy who's been by your side and treated you as a friend and equal constantly for like a year, and you make him your literal servant and constantly order him around as a result? Literally what the fuck. It's a disgusting power imbalance for a relationship we're supposed to see as either "best friends" or, in the future, a couple, and was actually something I was glad the show had avoided in the first two seasons by never having Marco suck up to Star's status as a princess or Star throwing her political weight around all the time.
Actually I don't know why I started with an "either;" the squire bullshit is 100% worse.>Marco
Same thing, when he accepted being Star's squire and started calling her "m'lady" and doing her literal dirty work. Star would've just looked like the bitch if she had tried to make him her squire and order him around and Marco was just like "lol, no, I'm not your slave, Star," but he did it, he actually fucking did it and in my eyes that makes him worse than her. He is Star's actual, literal bitchboy.
Now to be fair, this could turn around. Star's pretty much broken up with Tom; Marco actually wasn't a bitch in the last finale. If they cut out the>Lick the floor for me, squire>Of course m'lady
shit things could be okay.